Crossword Genius

Change the law (7)

Ross

I believe the answer is:

coppers

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'change' is the definition.
(as in copper coins)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for coppers that I've seen before include "loose change?" , "Old pennies and policemen" , "Pence" , "The boys in blue (slang)" , "hardly any 11 [LOLLY]" .)

I've seen this clue in The Independent.
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